What's a "PU" grip?

Edit: I know Karakal makes a product called the Super PU. What is it? An overgrip or a replacement grip? It's confusing, because on their web site, they have a section for replacement grips and they have a different section for the Super PU grip, but they don't explain the difference.

Anyway, is the Karakal Super PU grip an overgrip or a replacement grip. I searched and am much more confused, because there are people who refer to it as one thing and others who refer to it as the other

a PU grip is a replacement grip and it's something that I now have on many of my racquets under my overgrip.

Why I put it on all my racquets? Simple, it's long,, it's tacky, it weights only 15g and it's quite thin (90% of the time it's thinner that the original repl grip of the racquet). No dimples, no holes, no nothing, simple and efficient. Don't believe me? Ask Henman.

As I understand it, PU is a material that is used for many applications. Many multi strings use it as an immersion, or matrix, to soften the string and to reduce vibration. Furniture glue has a lot of PU in it. It's used for many tennis grips and overgrips because it's tacky, soft, durable and absorbs vibration.

PU is like a glue. Glue does not absorb sweat so count on the fact that it will make your grip slippery. Also, PU does not absorb vibration, lol.

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It's used in glues, but it's not a glue. It can be used in grips without them being slippery, but oftentimes wet tacky grips do get slippery. And about PU not absorbing vibration, can anyone clarify this?